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Long-term debt - Scrubber Financing (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Atradius Facility
Debt Instrument [Line Items]
Number of vessels financed for scrubber equipment and installation	42
Songa Vessels
Debt Instrument [Line Items]
Number of vessels financed for scrubber equipment and installation	10
Scrubber equipment
Debt Instrument [Line Items]
Remaining borrowing capacity	$ 46,227
Scrubber equipment | Atradius Facility
Debt Instrument [Line Items]
Amount drawn down	33,311
Scrubber equipment | DNB $310,000 Facility
Debt Instrument [Line Items]
Amount drawn down	51,202
Scrubber equipment | SEB Facility
Debt Instrument [Line Items]
Amount drawn down	1,260
Scrubber equipment | ING $100,600 Facility
Debt Instrument [Line Items]
Amount drawn down	5,600
Scrubber equipment | CMBL
Debt Instrument [Line Items]
Amount drawn down	$ 12,165

X

- Definition

The number of vessels financed by the debt instrument.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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X

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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